Bonjours, je dois résoudre les équations suivante mais je n'y arrive pas merci d'avance 5y+7=y+1 a-1=-5-a 18+x= -x (5/4x-3) (3x-1)= (15/4x+7/6) (x-1/3)

5y + 7 = y + 1
5y - y = 1 - 7
4y = -6
y = -6/4
y = -3/2

a - 1 = -5 - a
a + a = -5 + 1
2a = -4
a = -4/2
a = -2

18 + x = -x
x + x = -18
2x = -18
x = -18/2
x = -9

(5/4x - 3)(3x - 1) = (15/4x + 7/6)(x - 1/3)

15/4x^2 - 5/4x - 9x + 3 = 15/4x^2 - 5/4x + 7/6x - 7/18

3 - 7/18 = 9x + 7/6x
54/18 - 7/18 = 54/6x + 7/6x
47/18 = 61/7x
x = (47*7)/(18*61)
x = 329/126